<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script src="demo.js"></script>
		<script type="text/javascript">
			alert(444);
			//document.write("dajiahao,woshi liulaoshi");
		</script>
	</head>
	<body>
		<button type="button" onclick="alert(99999)">点击</button>
	</body>
	<!--<script src="demo.js">
		alert(1000);
	</script>-->
</html>
